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Thresholdless Transition to Coherent Emission at Telecom Wavelengths from Coaxial Nanolasers with Excitation Power Dependent β-Factors
Citation key 2020_11_Kreinberg
Author Kreinberg, Sören and Laiho, Kaisa and Lohof, Frederik and Hayenga, William E. and Holewa, Pawel and Gies, Christopher and Khajavikhan, Mercedeh and Reitzenstein, Stephan
Pages 2000065
Year 2020
DOI https://doi.org/10.1002/lpor.202000065
Journal Laser & Photonics Reviews
Volume n/a
Number n/a
Month Nov
Abstract Abstract The ongoing miniaturization of semiconductor lasers has enabled ultra-low threshold devices and even provided a path to approach thresholdless lasing with linear input–output characteristics. Such nanoscale lasers have initiated a discourse on the origin of the physical mechanisms involved and their boundaries, such as the required photon number, the importance of optimized light confinement in a resonator, and mode-density enhancement. Here, high-β metal-clad coaxial nanolasers, which facilitate thresholdless lasing are investigated. Both the conventional lasing characteristics, as well as the photon statistics of the emitted light at 10 K under continuous wave excitation are experimentally and theoretically investigated. While the former lacks adequate information to determine the threshold to coherent radiation, the latter reveals a finite threshold pump power. The work confirms an important aspect of high-β lasers, namely that a thresholdless laser does have a finite threshold pump power and must not be confused with a hypothetical zero-threshold laser. Moreover, the results reveal an excitation power dependent β-factor which needs to be taken into account to correctly describe the experimental data.
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